Punching-machine.



No. 766,030. PATENTED JULY 26, 1904. D. D. PROTHINGHAM. PUNCHINGMACHINE.

APPLIOATION FILED JULY 21, 1903. -N0 MODEL. 4 SHEETSSHEET 1.

if" 36 t" E s 5 e5 No. 766,030. PATENTED JULY 26, 19-04.

D. D. FROTHINGHAM. PUNCHING MACHINE.

APPLICATION FILED JULY 21, 1903.

NO MODEL. 4 SHEE S-SHBET 2.

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No. 766,030. I PATENTED JULY 26, 1904. D. 1). FROTHINGHAM;

PUNCHING MACHINE.

APPLICATION FILED JULY 21, 1903.

NO MODEL. 4 SHEETS-SHEET a.

\ /Pnqessas: i H a? I \/E LEI I a lmz h 56 0M6? No; 766,030 PATBNTEDJULY 26, 1904.

D. D. PROYTHING'HAM. PUNOHING MACHINE.

AP PLIU ATION FILED JULYZI, 1903.

4 SHEETS-SHEET 4 N0 MODEL.

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PATENT UEETCE.

PUNCHlNG-IVIACHINE.

SPECIFICATION forming part of Letters Patent No. 766,030, dated July 26,1904.

Application filed July 21, 1903. Serial No. 166,429. (No model.)

To all whom it may concern.-

Be it known thatLDANIEL D.FRoTHINeHAM, a citizen of the United States,residing at Salem,EsseX county, State of Massachusetts,have invented anew and useful Improvement in Punching-Machines, of which the followingis a specification.

My invention relates to improvements in punching-machines, and moreparticularly to machines for punching sheet material.

My invention consists in improved female punching-dies and followers forclearing the stock and article punched from said dies and in the formsand combinations as hereinafter fully set forth in the specification andparticularly pointed out in the claims.

Referring to the drawings,Figure 1 is a front elevation of my improvedpunching-machine. Fig. 2 is avertical longitudinal section taken on line2 2 of Fig. 1, the same-being partly broken away to save space in thedrawings. Fig. 3 is a detail plan of the follower-plate and dies,together with the ad justing-plates, for adjusting said dieslongitudinally and a portion of the screws by which said adjustingplatesare moved. Fig. 4 is a front elevation of the parts illustrated in Fig.3, the adjusting-screws being shown in section. Fig. 5 is a sideelevation of the parts illustrated in Fig. 4: looking toward the rightin said Fig. 1, the adjusting-screws being omitted. Fig. 6 is aperspective view of the die and inside follower. Fig. 7 is a perspectiveview of one of the female-punch-adj usting plates. tional elevationtaken on line 8 8 of Fig. 3 looking from the front of the machine. Fig.9 is a section taken on line 2 20f Fig. 1 looking toward the right insaid figure, the outside follower-plate being illustrated in itslowermost position, a section of leather and a dieplate being shown inconnection therewith. Fig. 10 is a section taken on line 10 10 of Fig.9, the frame being partly broken away to save space in the drawings.Fig. 11 is a perspective view of the front comb-plate, and Fig. 12 is aplan and side elevation of a blank cut from a sheet of material by myimproved punchingmachine.

Like numerals refer to like parts throughout the several views of thedrawings.

In the drawings, 15 is the frame of a punch- Fig. 8 is a secing-machine,16 the main driving-shaft thereof, journaled to rotate in bearings 17 17and having rotary motion imparted thereto by a gear 18, driven by apinion 19, fast to a clutch-pulley 20. The clutch-pulley 20 may beoperated by any of the various clutch mechanisms well known to thoseskilled in the art.

Upon the forward end of the shaft 16 is fastened an eccentric 21,encircled by an eccentric-strap 22, pivotally connected at its lower endby a pin 23 to a plunger 24, arranged to slide in ways 25, formed in theframe 15. The lower end of a plunger 2 1 has a die-plate 26 fastenedthereto by screws 27 27 Said dieplate is formed of soft metal,preferable copper. Beneath 'the die-plate 26 is a series of femalepunching-dies 28 28, each of said dies supported upon a Wedge-shapedadjustingplate 29, havingahorizontal upper surface and a beveled lowersurface. The beveled lower surfaces of the adjusting-plates 29 rest upona corresponding beveled surface formed in the frame 15 of the machine.Each of the adjusting-plates 29 is slotted at 30 to receive acylindrical head 31, formed upon an adjustingscrew 32, havingscrew-threaded engagement with the frame 15 of the machine.

Each of the female punching-dies 28 28 consists of a rectangular bodyportion 33 and a hollow cylindrical upper portion 34, provided with acutting edge 35 upon the top thereof. The bottom of the rectangular bodyportion 33 of each of the punching-dies 28 rests upon the horizontal orupper face of the, adjustingplate 29, and it will be .seen that byturning the ad justing-screw 32 in the proper direction theadjusting-plate 29 will be moved toward the right or the left, as thecase may be, Fig. 2, thus raising or lowering, respectively, thepunching-die which rests thereon. In the interior of each of saidpunching-dies 28 and concentric therewith is located a smaller femalepunching-die 36, provided with a screwthreaded shank 37, which isscrewed downwardly into the rectangular body portion 33. Atube 38, alsohaving screw-threaded engagement with the rectangular body portion 33,extends downwardly from the lower end of the punching-die 36, the upperend of said tube bearing against the lower end of said innerpunching-die, so that when said tube is screwed firmly against the lowerend of said inner punchingdie it forms a lock to hold said innerpunching-die in fixed relation to said outer punching-die.

The rectangular body portions 33 of the punches 28 28 are clampedagainst a vertical plane surface 39, formed in the frame by aclamp-plate 40, which is forced against said rectangular body portionsby screws 41 41. The rectangular body portions 33 33 are also forced oneagainst the other by clamp-screws 42 42 having screw-threaded engagementwith the lateral projections 43 43 upon the clampplate 40. Said lateralprojections 43 43 extend into slots 44 44, formed in the frame 15, andthus guard against longitudinal displacemept of the clamp-plate 40. (SeeFigs. 9 and 10.

In the interior of the female punching-dies 28 28 is located a follower45, which consists of a hollow cylinder filling the space between theinterior of said punching-die 28 and the exterior of the punching-die36. The follower45 is moved longitudinally of the punching-dies 28 and36 by fingers 46 46, formed upon the front comb-plate 47 and the rearcomb-plate 48. Said fingers project through slots 49 49 in thepunching-dies 28 and into slots 50, formed in the follower 45. Thecomb-plates 47 and 48 are fastened together by bolts 51 51 and by atie-plate 52, extending entirely over the top of said comb-plates and.fastened thereto by screws, Figs. 3 and 4. The tie-plate 52 is providedwith holes 53 53, and through these holes the dies 28 28 project. Thecomb-plates 47 48 and tie-plate 25 form as awhole an outsidefollower-plate 54, to which is rigidly attached a downwardlyprojectingguide-rod 55, arranged to slide vertically in the frame 15. Saidguide-rod has a collar 56 fast thereto and bearing against the upper endof a spiral spring 57, the lower end of said spring resting upon asupportingbracket 58, fast to the frame 15. Upon the lower end of therod is an adjusting-nut 59 and a set-nut 60, by means of which theheight I to which the follower-plate 54 can be raised by the spring 57is regulated. The followerplate 54 is positively raised by means of therods 61 61, fast at their upper ends to the plunger 24 and projecting attheir lower ends through slots 62 62 in the follower-plate 54. The lowerends of the rods 61 61 are screwthreaded to receive nuts 63 63, and asthe plunger 24 ascends the nuts 63 63 will abut against the under faceof the ears 64 64 upon the follower-plate 54 and positively raise saidfollower-plate, together with the comb-plates 47 and 48, to the positionshown in Fig. 2.

The machine hereinbefore described and illustrated in the drawings isadapted to punch from a sheet of material a series of diskshaped washerswith a hole in the center thereof, the general operation of the machinebeing as follows: The piece of sheet material 65 is placed upon the topof the plate 52, as illustrated in Fig. 2. The operator then places hisfoot upon the treadle, operating a clutch, (not shown in the drawings)which rotates the clutch-pulley 20, pinion 19, gear 18, shaft 16, andeccentric 21, lowering the plunger 24 and driving the die-plate 26downwardly in contact with the upper face of the sheet material 65. Saidsheet material is upon a continued downward movement of the die-plate 26forced downwardly upon the punching-dies 28 and 36, the follower-plate54 and follower 45 descending from the position shown in Fig. 2 to thatshown in Fig. 9. It will thus be seen that a disk-shaped piece of sheetmaterial 66 is punched by each of the dies 28 from the sheet of material65 and a hole punched through said disk 66, as illustrated in Fig. 9.Upon the ascent of the plunger 24 the sheet of material 65 is carriedupwardly by the follower-plate 54, and the portion of material 67punched out of the disk 66 remains in the interior of the punch 36. Asthe follower-plate 54 ascends, being carried upwardly by the rod 61 andnut 63, the projections 46 46 upon the comb-plates 47 48 carry theinside follower 45 upwardly, ejecting the disk 66 from the interior ofthe punching-die 28. The portion 67 punched from the center of said diskremains in the interior of the punching-die 36 until the next descent ofthe plunger, when it is forced downwardly, and as successive disks arepunched from the sheet of material these portions 67 pass downwardlythrough the interior of the punching-dies 36 and. tubes 38 and fall outat the lower end of said tubes. The spiral spring 57 holds thefollower-plate 54, together with the sheet of material 65, in theposition shown in Fig. 2 during the first portion of the downward motionof the plunger 24 until the die-plate 26 contacts with the upper surfaceof the sheet material 65. It will be seen that each of the punching-diesis independently adjustable, so that said dies 28 may be ground and thenadjusted until the cutting edges are all in the same horizontal plane.

Having thus described my invention, what I claim is 1. In apunching-machine, a stationary female punching-die, a follower therein,a follower-plate outside thereof, a finger fast to said follower-plateprojecting through a slot provided in said female die and adapted toengage said follower, and mechanism to move said follower-platelongitudinally of said punching-die.

2. In a punching-machine, a stationary female punching-die, a followertherein, a follower-plate outside thereof, a reciprocatory plunger, adie-plate fast to said plunger, and means connecting said plunger tosaid follower-plate.

3. In a punching-machine, a stationary female punching-die, a followertherein, a follower-plate outside thereof, a reciprocatory plunger, adie-plate fast to said plunger, and means adjustably connecting saidplunger to said follower-plate.

other, a follower located between said dies, a

follower-plate outside said dies, and mechanism to move said followerand follower-plate longitudinally of said punching-dies.

6. A punching-machine comprising in its construction a femalepunching-die, said die consisting of a hollow cylindrical upper portionand a rectangular body portion provided with slots extendinglongitudinally thereof and diametrically opposite to each other.

In witness whereof I have hereunto subscribed my name this 20th day ofJuly, 1903.

DANIEL D. FROTHINGHAM.

In presence of RUFUs PIERCE HANSON, FRED C. CHAMBERLIN.

